POWER CONTROLLER FOR COMPENSATING VOLTAGE SUDDEN CHANGE

摘要

PROBLEM TO BE SOLVED: To inexpensively provide a power controller for compensating a voltage sudden change occurring in a power distribution system to a slow voltage change state.

SOLUTION: The power controller for compensating the voltage sudden change includes a voltage command signal generating unit for generating a voltage command signal for feedback controlling a PWM inverter and a PWM drive signal generating unit for controlling the output waveform of the inverter as a unit for supplying a compensating current from the inverter connected to a distribution line in short time rating. The power controller obtains the voltage command signal according to a difference between an instantaneous voltage stabilization signal and a low-speed detection voltage signal. The voltage command signal generating unit is formed of an instantaneous voltage stabilization signal generating means and a voltage error signal generating means. The voltage controller can feedback-control corresponding to the sudden change of the distribution system voltage by using the instantaneous voltage stabilization signal instead of a reference voltage and feedback-controlling the PWM inverter by the voltage error signal of a short time signal obtained by the difference between the stabilization signal and the low-speed detection voltage signal.

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